The difference between Booklet and Junk mail
When used as nouns, booklet means a small or thin book, whereas junk mail means any mail or letters that are not welcome or solicited and typically sent in bulk.
check bellow for the other definitions of Booklet and Junk mail
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Booklet as a noun:
A small or thin book.
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Junk mail as a noun:
Any mail or letters that are not welcome or solicited and typically sent in bulk; especially mail of a commercial nature such as advertising circulars and form letters.